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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 4th Oct 2018, 11:41 am   #1
Wendymott
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Default Filter ???

Hi peeps... I bought this.. "pig in a poke" last night at a junk sale.. I know its a filter........ a High power filter at that.. but does anyone know more about it please ?
It had many torx screws, the block is machined aluminium and the top is,silver plated......looks military...
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Old 4th Oct 2018, 12:12 pm   #2
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Default Re: Filter ???

Hi Wendy,
My guess would be that it came out of a mobilephone base station installation, possibly the antenna diplexer filter to separate transmit from receive with single antenna working. The big connector (DIN7/16 type) would be the antenna connection, SMA the receiver and the N type the transmitter. Probably tuned around 800/900Mhz.
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Old 4th Oct 2018, 1:42 pm   #3
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Default Re: Filter ???

I'll second Peters opinion, the lengths of the bits look like 900MHz ish. Beautifully made too.
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Old 4th Oct 2018, 3:00 pm   #4
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Arrow Re: Filter ???

This might be relevant:
https://directory.thesun.co.uk/13483400

Al.
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Old 4th Oct 2018, 3:24 pm   #5
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Default Re: Filter ???

Oulu, Finland is also the location of a well known cellphone company.

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Old 4th Oct 2018, 5:03 pm   #6
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Default Re: Filter ???

The telecoms arm of ADC (now owned by TE Connectivity) was based in Minneapolis

I believe ADC supplied TMA and GMAs to OEMs and this probably the duplexer from one

I never saw this part though

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Old 4th Oct 2018, 5:05 pm   #7
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Default Re: Filter ???

Quote:
Originally Posted by Skywave View Post
This might be relevant:
https://directory.thesun.co.uk/13483400

Al.
This is a LOT more relevant!

https://en.wikipedia.org/wiki/ADC_Telecommunications

I am but a footnote [14] in that!

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Old 4th Oct 2018, 10:06 pm   #8
Wendymott
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Default Re: Filter ???

Ok thanks peeps.....It just looked interesting and HEAVY.. Nothing really of worth..except the M3 torx screws, I cannot see me salvaging the tubular capacitors.. or stand offs..
If anyone wants it...call and collect.
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Old 4th Oct 2018, 11:58 pm   #9
Herald1360
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Default Re: Filter ???

A machined lump of non ferrous metal of that size may have a useful scrap value if weighed in "clean" with any odd metal bits and pieces removed!

Copper about 3/kg, brass about 2-50/kg and aluminium about 50p/kg.
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Old 7th Oct 2018, 12:04 pm   #10
Wendymott
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Default Re: Filter ???

Chris... its actually machined brass.. with a silver coat... although I guess the silver would be microns thick. I will weigh it in.

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Last edited by Wendymott; 7th Oct 2018 at 12:05 pm. Reason: Additiopnal info
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